Arm and bedplate for sewing machines



April 9, 1929.

C. H. GREENWOOD 'ARM AND BED PLATE FOR SEWING MACHINES Filed June 9,1923 2 Sheets-Sheet 1 gwvmtoz C. H Greerzwaod April 9, 1929. c. H.GREENWOOD ARM AND BED PLATE FOR SEWING MACHINES Filed June 9, 1923 2Sheets-Sheet 2 CH. Greenwood Sign Patented Apr. 9, 1929.

CHARLES H. GREENWOOD, 0F CANTON, OHIO.

ARM AND BEDPLATE FOR SEWING MACHINES.

Application filed. June 9, 1923.

This invention relates to die castings for the arm and bed plate of asewing machine, and has for its objects to provide a sewing machine armformed. oftwo similar halves, one-half of the bed plate being formedintogrally with each half of the arm.

The above and other objects may be attained by constructing the parts inthe manner illustrated in the accompanying drawings, in which Figure lis a top plan view of the arm and bed plate castings assembled;

Fig. 2, an elevation of the inner side of the casting for one-half ofthe arm and bed plate;

Fig. 3, a front end elevation of the same; Fig. 4, a rear end elevationof the same; Fig. 5, section on the line 55, 2; Fig. 6, a section on theline 66, 2; Fig. 7, a section on the line 7-7, Fig. 2;

' formed in a single casting, an arm being connected thereto by screwsor the like. Such a construction requires considerable machine work inorder to the mechanism within the arm and base plate and thepresentimprovement is designed to overcome all of this expensive machinework by forming the arm and base plate of two similar die castingsconnected together through their longitudinal center.

The arm and base plate are made up of two substantially similar sections1 and 2, the section 1 being shown in Fig. 2. Each section comprisesone-half of the base plate, as shown at 3, one-half of the standard 4-,one-half of the arm 5 and one-half of the head 6.

The standard portion of each casting is provided With a half of abearing shown at 7, these portions being arranged to register Whenthehalves are connected together as shown in Fig. 1. The bearing 7 isaligned with similar bearings 8 and 9 formed in Serial No. 644,395.

each half of the arm. The bearings 7 8 and 9 are aligned to receive theusual driving shaft which is provided at its outer end with the usualhand wheel, and has its inner end operatively connected to the mechanismwithin the head for reciprocating the needle bar and the associatedmechanism.

Each half of the standard is provided with a half of a bearing 10 andeach half of the base plate has a half of a bearing 11 aligned with thebearing 10, and arranged to re'seive a vertical shaft which transmitspower from the drive shaft to a horizontal shaft which is mounted inbearings 12 and 13 formed upon the under side of each half of the baseplate, this last named shaft being provided for transmitting power tothe shuttle which is mounted beneath the forward end of the base platein the usual manner, each section of the base plate being cut out as at14. to receive the usual shuttle plate.

Each section of the head 6 is provided with the central, vertical, halfround hearing portion 15 arranged to receive the usual verticallyslidable needle bar and the section 1 is provided with a verticalbearing 16 to receive the usual presser foot bar.

Dowel pins 17 are provided in different portions of the inner face ofone section to be received in corresponding apertures in the othersection, in order to properly center the two halves, screws 18 beinglocated through transverse apertures 19 in the two sections for thepurpose of combining the same together.

Referring to Fig. 7, it will be noted that a partition wall 20 isprovided through which the upper end of the presser bar bearing 16 isextended, thus preventing oil from passing down through the head and onto the presser foot. The presser foot lift lever is extended through theslot 21 which terminates at the partition wall 20.

By forming the castings in this manner it will be seen, by referring toFig. 2, that oil wells are provided in the head, to oil the workingparts therein, and also in the arm and the standard, between thebearings 8 and 9, and the bearing 9 and bed plate respectively, thusproviding self oiling means being provided with half round grooves atforall of the inclosed Working parts of the ranged to register Witheachother and form machine.

I'claim An article of manufactureincluding a pair of similar hollow diecastings, each comprising one-half of the bed plate, standard, arm

and head of a sewing machine, said castings bearings for the drivingshafts of the sowing machine. I

In testimony that I claim the above, I have hereunto subscribed my name.

CHARLES H. GREENWOOD.

